600s | d=610s | dn1=620s | dn2=630s | dn3=640s }} Events By Place Byzantine Empire The Avars attack Constantinople. Asia The Second Perso-Turkic War's fought and ended with Decisive Sassanid victory. The Meccan boycott of Hashemites and Muhammad ends. By Topic Arts and Sciences The calculation of the Chinese calendar begins to use true motions of the sun and moon modeled using two offset opposing parabolas. The Chinese begin using large orchestras. Religion December 23 &… (More on 619)